Electric-arc lamp.



No. 630,5l3. Patented Aug. 8, I899.

J. E. monms, Decd. C. E. MORRIS, Administrator.

ELECTRIC ARC LAMP.

(Application filed Nov. 1, 1898.) (lo Iodul.)

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WITNESSES:

INVENTOR:

ddMTtTLVQ mm (Mm f r Io. 630,513. Patented Aug. 8, I899.

' J. E. monms, Decd. C. E. MORRIS, Administrator. ELECTRIC ARC LAMP.

(Application filed Nov. 1, 1898.) (No Model.) 3 $heots8hoat 2,

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No. 630,5I3. Patented Aug. 8, I899. J. E. MORRIS, Decd.

0. E. MORRIS, Adminiatrator. ELECTRIC ARC LAIP.

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WITNESSES:

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Mm M UNITED STATES PATENT OFFICE.

CHARLES E. MORRIS, OF CHESTER, PENNSYLVANIA, ADMINISTRATOR OF JAMES E. MORRIS, DECEASED, ASSIGNOR TO THOMAS \VILBY, OF SAME PLACE ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 630,513, dated August 8, 1899.

Application filed November 1, 1898. Serial No. 695,157. (No model.)

To aZZ whom it may concern.-

Be it known that JAMES E. MORRIS, late a citizen of the United States, and a resident of the city of Chester, in the county of Delaware, in the State of Pennsylvania, deceased, did invent certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

Thisinvention relates to electric arc lamps, and its principal object is to provide a lamp of this character of usual size but in which a long upper carbon may be fed forward and almost entirely consumed before it-is necessary to replace it, with the result that less frequent removals of old carbons and substitutions of new ones will be required, a result heretofore only accomplished by employing unduly long lamp frames adapted to receive long upper carbons.

In the accompanying drawings is shown and herein is described, a good form of a 0011- venient embodiment of the invention, the particular subject-matter claimed as novel being hereinafter definitely specified.

In the accompanying drawings,

Figure 1 is a view in side elevation of a lamp embodying the invention.

Figure 2 is a central, vertical, sectional, elevational, view of the same, section being supposed on the dotted lines 2-2 of Figures 3 and 4t, and sight being take in the direction of the arrows applied to said lines.

Figure 3 is a top plan view of the lamp structure.

Figure L is a sectional plan, section being supposed in the plane of the dotted line 4E L of Figure 1.

Figure 5 is a central, sectional, elevational, view of the dash pot removed from thelamp.

Similar letters of reference indicate corresponding parts.

The lamp is provided with the usual frame and associated parts (the casing being, for clearness of illustration, omitted), which consist of an upper plate a, a lower plate a side bars of connective of said plates, a depending hanger aconnected to the lower plate a and supporting a socket 11 a globe a, and a lower carbon a ,-all the parts re ferred to being of usual form and arrangement.

c c are binding posts disposed upon the upper plate a of the frame, to which are respectively connected the line conductors b U The binding post 0 has a contact plate 0 with which the inner end of a movable switch bar 0 is adapted to make contact. This switch bar is mounted upon a conducting pivot 0 to the lower end of which the magnet coil D is through the conductor d connected.

The magnet D, which is of any ordinary character, is secured to the lower face of the upper plate a, and disposed within it, free for vertical reciprocation, is a core E formed with a central axial aperture,and equipped as to its lower end with a lateral extension e.

F is a dash-pot conveniently suspended from the upper plate a in the vicinity of the magnet, and provided with a piston head f adapted to move vertically therein, and a piston rod f of novel construction, connected to said piston head, the lower end of which is connected to the rigid lateral projection c of the magnet core.

The upper end of the piston rod extends through the piston head, and has slight independent longitudinal play with respect to the same, being limited in such independent movement in one direction by the contact of its flaring upper end with the upper face of the head and in the other direction by the contact of a boss or enlargement f intermediate of its length, with a slightly recessed seat in the lower face of said head, as shown particularly in Figure 5.

- The piston rod is for the upper portion of its length hollow, or provided with a bore from its upper end to a point in the vicinity of the boss or enlargement f referred to, and the wall of the rod is at a point near the lower end of said bore provided with a lateral outlet adapted to place said bore in communica tion with the atmosphere, below the piston head, said bore and outlet together forming a channel f Manifestly in the ascending movement of the piston of said dash-pot the lower end of the said channel will be closed by the contact of the boss f with the seat in the lower face of the piston head, so that no escape will be afforded for the air above the head, with the result that a very effective air cushion will be formed; while, upon the other hand, when downward traction is applied to the piston red, the latter will be drawn downward independently of the piston head until the lower end of the channel is no longer closed by the contact of the piston head, and until the flared upper end of the rod encounters the upper side of the piston head, with the result that the space above the piston head will be placed in communication with the space below the head, so that air from the lower side of the head can pass to the upper side of the head through the channel of communication, and the subsequent descending movement of said piston rod and piston head will be quick and exempt from any retardation by the air.

G is a hollow carbon sleeve of brass or other suitable material, of such dimensions as to approximately tit upon the exterior of the upper carbon, Z, and snugly ht the interior of the hollow magnet core, to which it is secured by the screw i, said carbon sleeve being of such length and proportions as convenience of manufacture and the surroundings of the lamp may dictate.

The said sleeve, as will be understood, is, with the carbon in place within it, to be located within the bore of the magnet core as shown in Figure To prevent undue movement of the carbon with respect to the sleeve, and to assist to re tain said two parts in their contemplated normal relationship, a holder of any suitable character is provided, and conveniently a collar or band 9 such as is shown in Figure 2, that is to say, a collar or band adapted to encircle the carbon and provided, conveniently as to both its upper and lower edges, with series of projections or serrations some of which are given an inward set to cause them to clasp the carbon, while others are given an outward set to cause them to make contact with the inner face of the sleeve.

II, Figure 2, is an annulus having a bore of dimensions very slightly exceeding in diameter the upper carbon upon which, below the lower end of the sleeve G, it is seated. This annulus has a projecting finger h to the outer end of which is connected the lower end of a link 7t the upper end of which is connected to the magnet core.

Manifestly, when the annulus is in a horizontal position the carbon may move quite freely vertically through it; when, upon the contrary, the annulus is slightly tilted as shown in Figure 2, so that the walls of its bore are no longer parallel with the walls of the carbon, it will bind upon said carbon, and it it then be drawn upward the carbon will be drawn upward with it.

So soon, however, as the annulus is restored to a horizontal position, the carbon will be free to move vertically through it.

J, Figures 1 and 2, is a guide eneirclingthe lower portion of the carbon sleeve, and adapted by being conveniently supported upon a suitable standard j erected from the lower plate a to retain it in vertical position.

The portions of the apparatus not specifically described are of ordinary and well known construction.

The current which enters the lamp through the conductor Z1 makes contact with the binding post 0 as stated, is conducted thence by the conductor 11 to the binding post Zr and thereby placed in circuit with the magnet core, from which it passes through the upper and lower carbons, thence through one of the hangers o; to the resistance K (Figure l), to a binding post 7.1 (Figure l), thence through a conductor L (Figure 1) to the magnet coil, and from the magnet coil by the conductor (1 to the switch.

The operation of the apparatus will be readily understood: The carbons being normally in contact, as soon as the switch 0 is thrown and the lamp placed in circuit, the magnet coil will become energized and elevate the magnet core, and, with the core, by virtue of the annulus and its connections, also elevate the upper carbon and the carbon sleeve, so that an arc interval will be formed between the opposing extremities of the earbons,with the result that the light will be generated.

As, in the continued operation of the lamp, the carbons burn away, the interspace will become greater, and the current passing through the lamp will consequently diminish, with the result that the magnet core will slightly descend and lower the upper carbon the annulus and the sleeve.

If the descent is sufficiently great the annulus will as to its inclined lower end make contactwith the upper face of the lower plate a or its associated parts, and permit the can bon to descend a distance somewhat greater than the descent of the magnet core.

The interspace between the carbons will thus be diminished and the strength of the current increased, with the result that the magnet coil will become stronger and slightly elevate the magnet core and the connected parts.

If in the descent of the parts the annulus has become horizontal so that the carbon has descended through it, the annulus will in taking hold of said carbon make contact with it at a point slightly above the point at which it was formerly engaged.

3y reason of the connection between the magnet core and the dash-pot, the ascent of said magnet core will be retarded and cushioned by the air behind the piston head, so that the upward movement of the carbon will be gradual and easy, while, upon the other hand, the descending movement of the upper carbon will, owing to the air assage in the piston rod, be very quick and sensitive to the changes in the force of the current.

Manifestly, a carbon of the length of that shown in Figure 2 will burn for many days, or until its upper end is in close proximity to the lower end of the tube.

As a result of this invention it is obvious that the longer period during which the upper carbon may burn before it is necessary to replace it, is due not to any excessive length of the carbon, but to the fact that the length which it possesses is supplemented by the carbon-inclosing sleeve with respect to which it has telescopic movement, so to speak,-with the result that the upper carbon may be fed down toward the lower carbon for a longer period than would be possible if the sleeve were not employed.

The invention, therefore, provides a lamp of ordinary dimensions in which a single carbon may be kept burning for a period only heretofore equaled in lamps of much larger size and adapted to receive and feed an upper carbon provided with a rod or other extension which renders it in eitect twice the length of the carbon illustrated.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is-

1. In combination, a magnet, a magnet core, a dash-pot provided with a piston head adapted for movement therein, a piston rod, a rigid matically opened in the descending lnovement of the piston rod, substantially as set forth.

2. In combination, a magnet, a magnet core, a dash-pot provided with a piston head the piston rod of which is connected to the magnet core, a sliding connection between said piston head and said piston rod, and a bore extending from the upper end of said piston rod and opening through its side, substantially as set forth.

3. In combination with the magnet, a magnet core, a dash-pot, a piston head mounted in said dash-pot and having a recess in its lower face, and a piston rod movably connected to said piston head and provided with a boss f and a channel f substantially as set forth.

In testimony whereof I have hereunto signed my name this 17th day of October, A. D. 1898.

CHAS. E. MORRIS, Aclam'nistmtor ofthe estate ofJamesE. Jlforris.

In presence of- CLARENCE F. TILBY, GEORGE THOMAS. 

